yes it's there in the preferences. I know where it is under WSAD 5.1.1 (Eclipse 2.1) but I'm not sure if it's exactly the same under eclipse 3.X......

just browse around in there, you should find a place for defining/changing the new file template (which should work for non-Java files too?), another for the new Java class template, still more for the new java method template, etc. etc. (new constructor template, new getter/setter template, new implemented method from an interface, new overridden method, etc.) all sorts of places you can customize the auto-generation of java code and/or comments.

There are even more things you can customize for fields in comments (e.g. "@author" expanding out to your preferred way of giving your own name/email address), and you can even add your own completely new code generation templates (I once added an "ourJdbcTryCatchFinally", which inserted a whole block of boilerplate code, opening a 'try', getting a connection, preparedstatement, resultset, doing our error log thing in the 'catch', and closing them all in the 'finally'), if I type "ourJ" and control-space for completion etc.).

Presumably your python, ruby etc. plugins, if they are well-behaved Eclipse plugins, should add their own preference options to the overall ones, so you should find them there too.

Also you can import and export these preferences/templates to various xml files, from the preferences pages where you define/edit them. I get like 3 or 4 different xml files, when I export from all the places that have 'export/import' buttons, e.g. my various collected customizations and templates, in old WSAD/Eclipse 2.1. I'm sure it's even spiffier now, in Eclipse 3.2.X or whatever...